keepalived主动切换vip，邮件通知

1.主动切换vip

通过vrrp_script判断，调节权重进行切换

! Configuration File for keepalived  global_defs {     notification_email {           root@localhost   }     notification_email_from [e-mail]   smtp_connect_timeout 3     smtp_server 127.0.0.1     router_id LVS_DEVEL  }  vrrp_script chk_mantaince_down {   script "[[ -f /etc/keepalived/down ]] && exit 1 || exit 0"  #[ -f /etc/keepalived/down ]检查是否有down这个文件，如果真返回1，1代表失败，如果假返回0，0代表成功   # commadn1 && command2  只有在 && 左边的命令返回真（命令返回值 $? == 0），&& 右边的命令才会被执行   # commadn1 || command2  只有在 || 左边的命令返回假（命令返回值 $? == 1），|| 右边的命令才会被执行。   interval 1   weight -2   #只要上面exit 1,weight就-2，下面的101 -2 = 99 比BACKUP的100少了，优先级低了，就变成备用状态了，再次检测如果down没了，权重又成101了，就又变成MASTER了。这样就可以手动干预vip在节点间切换}vrrp_instance VI_1 {      interface eth0      state MASTER  # BACKUP for slave routers    priority 101  # 100 for BACKUP    virtual_router_id 51     garp_master_delay 1     authentication {          auth_type PASS          auth_pass password      }      track_interface {         eth0        }      virtual_ipaddress {          192.168.255.100/24    }      track_script {          chk_mantaince_down    }   }

2.在状态切换时进行通知

# notify scripts and alerts are optional
#
# filenames of scripts to run on transitions
# can be unquoted (if just filename)
# or quoted (if has parameters)
# to MASTER transition
notify_master /path/to_master.sh
# to BACKUP transition
notify_backup /path/to_backup.sh
# FAULT transition
notify_fault “/path/fault.sh VG_1”

1.使用:

notify_master
notify_backup
notify_fault
可以使用在vrrp_sync_group和vrrp_instance中，较多使用在vrrp_instance中
如果脚本带有参数，需要用”“扩起：notify_fault “/path/fault.sh VG_1”
当发生状态切换时，会根据切换的状态分配调用MASTER BACKUP FAULT指定的脚本

2.使用：

notify进行通知,notify可以使用在vrrp_sync_group和vrrp_instance中
此时脚本需要接受三个参数：
1指明组vrrpsyncgroup或实例vrrpinstance2 组或instance名
$3 “MASTER”|”BACKUP”|”FAULT”

# for ANY state transition.
# “notify” script is called AFTER the
# notify_* script(s) and is executed
# with 3 arguments provided by keepalived
# (ie don’t include parameters in the notify line).
# arguments
# $1 = “GROUP”|”INSTANCE”
# $2 = name of group or instance
# $3 = target state of transition
# (“MASTER”|”BACKUP”|”FAULT”)
notify /path/notify.sh

还是notify_master, notify_backup, notify_fault 这种好用

下面是一个notify.sh脚本的简单示例：

#!/bin/bash# Author: MageEdu <[e-mail]># description: An example of notify script# vip=172.16.100.1contact='root@localhost'notify() {    mailsubject="`hostname` to be $1: $vip floating"    mailbody="`date '+%F %H:%M:%S'`: vrrp transition, `hostname` changed to be $1"    echo $mailbody | mail -s "$mailsubject" $contact}case "$1" in    master)        notify master        /etc/rc.d/init.d/haproxy start        exit 0    ;;    backup)        notify backup        /etc/rc.d/init.d/haproxy stop        exit 0    ;;    fault)        notify fault        /etc/rc.d/init.d/haproxy stop        exit 0    ;;    *)        echo 'Usage: `basename $0` {master|backup|fault}'        exit 1    ;;esac

#MASTER:
##!/bin/bash
#vip=192.168.255.100
#concat=’root@localhost’
#thisis=ifconfig eno16777736|awk '/inet /{print $2}'
#
#notify() {
# mailbody=”vrrp transaction,vipfloatedtothisip”
# subject=”thisipbecomevip master”
# echo mailbody|mail−ssubject $concat
#}
#
#notify

于是配置文件变为

! Configuration File for keepalived  global_defs {     notification_email {           root@localhost   }     notification_email_from [e-mail]   smtp_connect_timeout 3     smtp_server 127.0.0.1     router_id LVS_DEVEL  }  vrrp_script chk_mantaince_down {   script "[[ -f /etc/keepalived/down ]] && exit 1 || exit 0"  #[ -f /etc/keepalived/down ]检查是否有down这个文件，如果真返回1，1代表失败，如果假返回0，0代表成功   # commadn1 && command2  只有在 && 左边的命令返回真（命令返回值 $? == 0），&& 右边的命令才会被执行   # commadn1 || command2  只有在 || 左边的命令返回假（命令返回值 $? == 1），|| 右边的命令才会被执行。   interval 1   weight -2   #只要上面exit 1,weight就-2，下面的101 -2 = 99 比BACKUP的100少了，优先级低了，就变成备用状态了，再次检测如果down没了，权重又成101了，就又变成MASTER了。这样就可以手动干预vip在节点间切换}vrrp_instance VI_1 {      interface eth0      state MASTER  # BACKUP for slave routers    priority 101  # 100 for BACKUP    virtual_router_id 51     garp_master_delay 1     authentication {          auth_type PASS          auth_pass password      }      track_interface {         eth0        }      virtual_ipaddress {          192.168.255.100/24    }      track_script {          chk_mantaince_down    }      notify_master "/etc/keepalived/notify.sh master"      notify_backup "/etc/keepalived/notify.sh backup"      notify_fault "/etc/keepalived/notify.sh fault"     #在脚本中配置邮件，或其他操作就可以了 }